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Revista Brasileira de Ensino de Física

Print version ISSN 1806-1117On-line version ISSN 1806-9126

Abstract

SISMANOGLU, Bogos Nubar; DO NASCIMENTO, Janaina Correa  and  DE BARROS ARAGAO, Eduardo Cezar Barbosa. Visualizing quantum tunneling by microplasma generation. Rev. Bras. Ensino Fís. [online]. 2015, vol.37, n.1, 1312.  Epub Mar 30, 2015. ISSN 1806-1117.  http://dx.doi.org/10.1590/S1806-11173711694.

The quantum tunneling is a phenomenon that provides numerous technological applications through direct application of the concepts of quantum mechanics. According to this phenomenon, electrons can be extracted from metal surfaces under which there is a huge potential gradient, ie, an intense local electric field. Through a system known as microhollow cathode two metal layers interspersed by a thin mica layer (with thickness d = 3 μm), perforated with holes of diameter D = 200 μm at a pressure of 20 Torr, led the extraction of cold electrons at a local electric microfield of approximately 15 V/nm. The voltage of about 390 V applied at these metals allowed the passage of electrons through the potential barrier at the cathode hole region. The Fowler-Nordheim curve confirmed the effectiveness of the phenomenon in the generation of microplasma inside the hole, visible to the naked eyes.

Keywords : quantum tunneling; microhollow cathode; Fowler-Nordheim.

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